Double writing instrument



FIG. 1 is a perspective view of the design;

FIG. 2 is a left side elevational view;

FIG. 3 is a right side elevational view;

FIG. 4 is both a rear and front elevational view as such views areidentical;

FIG. 5 is a top plan view; and,

FIG. 6 is a bottom view thereof.

The ornamental design for a double writing instrument, as shown anddescribed.